Re: Night Light: Utility Bike/Short Haul?
- From: SMS 斯蒂文• 夏 <scharf.steven@xxxxxxxxxxx>
- Date: Tue, 01 Jan 2008 03:36:47 -0800
(PeteCresswell) wrote:
<snip>
I'm wondering:
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- What the logical lighting arrangement is (i.e. number, type,
and placement of the illumination parts)
- If it makes any sense to mix in the drum brake thing here and get one of Sturmey's DynoHub/Brake hubs as per http://tinyurl.com/2uujok
- If something like Sheldon's setup with a NiCad
battery constantly being charged by the DynoHub through
a rectifier could be implemented in such a way as to require no rider intervention - ever.
- Considering the lower power consumption of LEDs, would a
couple of alkaline "C" batteries and carrying spares be
the simplest and lowest-cost power-side solution?
The decent front LED lights use a high power LED, and battery life is not in hundreds of hours like it is for LED flashers.
The best setup for a battery-free system would be a rear drum brake, a front dynamo hub, and a SolidLights 1203D ("http://www.solidlights.co.uk/products/1203d.php";).
You'd be spending about $700 on wheels and lights before you're through.
Your statement "I need light spread out - not just spotted on the trail ahead, but diffused to reveal objects at face/head height too" makes most lights for dynamo systems unacceptable, because they focus the limited light output such that it will not provide the type of illumination you want (the SolidLight is an exception).
If it were me I'd get a 3W Cree LED flashlight that runs on 2 C or 2 AA cells. But this definitely requires rider intervention. You could build something that allowed a dynohub to charge batteries, but the circuits actually end up being quite complex. There were a commercial product announced, but it never made to market "http://www.copycatsolar.com/index_files/Page657.htm";.
.
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